Electrode of green compact for discharge surface treatment, method of producing the same, method of discarge surface treatment, apparatus therefor, and method of recycling electrode of green compact for discharge surface treatment

Abstract

A green-compact electrode ( 1 ) for discharge surface treatment for use in a discharge surface treatment operation for forming a hard coating film ( 9 ) on the surface of an object ( 2 ) which must be machined by performing a discharging operation in working fluid ( 4 ) is structured such that powder ( 11 ) made of metal, such as W or Ti, and fluid ( 12 ) which is the same as working fluid are mixed with each other, and the mixed substance is compression-molded so that the green-compact electrode ( 1 ) for the discharge surface treatment is obtained.

What is claimed is:  
     
       1. A green-compact electrode for electrical discharge surface treatment of a work comprising: a compression molded mixture of a metal powder and a working liquid having a carbon component. 
     
     
       2. A green-compact electrode for electrical discharge surface treatment according to  claim 1 , wherein the working liquid constitutes 5 wt % to 10 wt % of the green compact electrode. 
     
     
       3. A method of manufacturing a green-compact electrode for electrical discharge surface treatment comprising: the step of compression-molding a mixed material of a metal powder and a working liquid having a carbon component. 
     
     
       4. A method of manufacturing a green-compact electrode for electrical discharge surface treatment according to  claim 3 , wherein a mixture ratio of the working liquid constitutes 5 wt % to 10 wt % of the green compact electrode. 
     
     
       5. A method of performing electrical discharge surface treatment comprising: 
       positioning a green-compact electrode comprised of a compression molded material of a metal powder and a working liquid having a carbon component opposite a work in a second working liquid, which is the same as the working liquid within the green-compact electrode; and  
       forming a hard coating film on the work by causing electrical discharge between the green compact electrode and the work.  
     
     
       6. An apparatus for performing electrical discharge surface treatment comprising: a green-compact electrode comprised of a compression molded mixture of metal powder and a working liquid having a carbon component; a work; a working tank for receiving said work; and means for causing an electrical discharge between said green compact electrode and said work. 
     
     
       7. A method of recycling a green-compact electrode for electrical discharge surface treatment comprising: 
       a) compression molding a mixed material of a metal powder and a working liquid having a carbon component to form the green-compact electrode;  
       b) positioning the green-compact electrode opposite a work;  
       c) performing discharge surface treatment by causing electrical discharge between the green-compact electrode and the work to form a hard coating on the work;  
       d) pulverizing portions of the green-compact electrode which are left after said discharge surface treating has been completed into powder, and  
       e) compression molding the powder obtained from the pulverizing step to obtain a new green-compact electrode.  
     
     
       8. A method of recycling electrodes used in electrical discharge surface treatment, comprising: 
       collecting used electrodes which are primarily composed of compressed powders;  
       pulverizing said used electrodes into a powder; and  
       compression molding said powder to form new electrodes,  
       wherein the compressed powders comprise metal powder and working fluid.  
     
     
       9. The method of recycling electrodes according to  claim 8 , comprising adjusting the mixture ratio of the metal powder and the working fluid.